When I place a mask in a photograph is place a yellow sheem over the masked aria. 
it is not the overlay colour which is red in my case. There are no presets active on masking as far as I know.
I work on an Apple Mac Book pro 16" M2 and Lightroom 13.3 as of today but this issue was there on previous updates as well. Anyone have a guess what's going on and how I can fix it?
You may be 'inheriting' some previously changed default for the adjustments.
A checkbox in the Masks panel can automatically reset everything for each new mask you create.
In the screenshot above, I had previously changed default adjustments to include -1.02 stop Exposure (and possibly other changes too), so that was what I automatically got for this newly made mask. Just before making the screenshot I turned on the option highlighted in yellow. So now for the next new mask I make, I can be certain its Exposure will begin at 0 - and so will all its other adjustment sliders.
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